dateline= писал(а):About Power Cords and Shielding

The powerChord by Audience is not shielded. We have found that shielding power cords can be sonically detrimental. There is a common misconception that noise is something airborne, picked up by cables, which can therefore be cured with more cable shielding. In real-world AC-powered systems, small leakage or ground noise currents will always flow in any wire connecting two devices. This tiny voltage drop is actually what causes 99% of the noise in consumer audio and video systems. Shielding power cords will do little to help this situation. Ordinary cable shielding, whether copper braid or aluminum foil, has virtually no effect on audio magnetic fields. Shields can also cause audible colorations due to raising the impedance of power cords. Increasing the distance between signal cables and powerful magnetic fields is the best cure for either electric or magnetic field problems.

PowerChords are a low impedance design. This minimizes the possibility of airborne noise coupling even further.